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Buy Murphy Vibration Switches from VIBES Corp

We carry a full line of Murphy Switches for use in monitoring and protecting your machinery.



VIBES CORP is well experienced in the installation of special devices like these to stop a potential disaster dead in its tracks. Call Us Today to have your machinery outfitted with this protection.

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VS  94 MODEL - Shock and Vibration Control Switch


  • NEMA 4X/IP66 Enclosure (CSA Types 4 & 12)
  • Protects Your Equipment from Excessive Shock or Vibration
  • Fine Adjustment to Precisely Select the Degree of Sensitivity
  • Reset from a Remote Location (Optional)
  • Time Delay to Override Trip Operation at Start-up (Optional)
  • Space Heater to Prevent Moisture Condensation Inside the Unit (Optional)

VS94 Series is an electro-mechanical device designed to protect equipment from damaging shock or vibration. This sensitive mechanism can detect excessive shock or vibration and shutdown the equipment before further damage occurs. A set of contacts is held in a latched position through a magnetic latch mechanism. As the level of shock or vibration increases an inertia mass exerts force against the latch arm and forces it away from the magnetic latch causing the latch arm to separate and to operate the contacts. Sensitivity is obtained by adjusting the amount of air gap between the magnet and latch arm plate.

The VS94 Series is housed in a NEMA 4/4X glass filled polyester enclosure and has a base mount. It is for applications in non-hazardous locations. VS94 models are rated up to 480 VAC. (See the How to Order section below for models and options available.)


Applications for the VS94 include all stationary types of machinery or equipment where excessive shock/vibration can be damaging or poses a threat to normal operations such as in:

  • Cooling fans
  • Engines
  • Pump jacks
  • Compressors
  • Pumps
  • Rotating and Reciprocating Machinery


  • Electromechanical Design
  • Detects Shock or Vibration in Three Planes of Motion
  • NEMA 4/4X (CSA types 4 and 12) Weather-proof Enclosure
  • Reliable Magnetic Latch Feature
  • Micro Fine, Easy-to-Adjust Sensitivity Adjustment
  • Manual Reset (Standard)
  • Remote Reset (Optional)
  • Adjustable Start-up Time Delay (Optional)
  • Space Heater Circuit to Prevent Housing Moisture Condensation
  • (Optional)
  • Two (2) versatile SPDT snap-switches rated up to 480 VAC.


Remote Reset

This option of the VS94 includes a built-in electric solenoid which allows reset of tripped unit from a remote location. Available for 115 VAC or 24 VDC.

Time Delay

Overrides trip operation on start-up. The time delay option is field-adjustable from 5 seconds up to 6-1/2 minutes with an easy-to-adjust 20-turn potentiometer. Available for 115 VAC or 24 VDC.

Space Heater

This optional circuit prevents moisture condensation inside the VS94 housing.


VS94 Series Models


  • Case: Polyester fiberglass reinforced; NEMA type 4X; IP66; CSA types 4 and 12.
  • Conduit Fitting: 3/4 NPT conduit fitting connection.
  • Normal Operating Ambient Temperature: 0 to 140°F (-18 to 60°C).
  • Snap-switches: 2-SPDT snap acting switches; 5A @ 480 VAC; 2A resistive, 1A inductive, up to 30 VDC.
  • Range adjustment: 0 - 7 G’s; 0 - 100 Hz /0.100 in. displacement.
  • Space Heater (optional):
    • Option    Operating Current
    • H15       .023 A @ 115 VAC
    • H24       .12 A @ 24 VDC
  • Remote Reset (optional):
    • Option    Operating Current
    • R15       .17 A @ 115 VAC
    • R24       .36 A @ 24 VDC
  • Time Delay (optional):
    • Option    Operating Current    Standby Current
    • T15       .360 A @ 115 VAC     .01 A @ 115 VAC
    • T24       1.15 A @ 24 VDC      .01 A @ 24 VDC
  • Time Delay/Remote Reset: Adjustable 20-turn potentiometer from 5 seconds to 6-1/2 minutes (15 seconds per turn approximately).
  • Shipping Weight: 4.35 lb. (2 kg.)
  • Shipping Dimensions: 9 x 8 x 4-11/16 in. (229 x 203 x 119 mm)

How to Order

To order your VS94 model use the diagram below.




VS2 Series  Shock and Vibration Switch



VS2 and VS2C

 Case: Equal to NEMA 3R. Suitable for non hazardous areas. 

VS2: Base mount 

VS2C: C-clamp mount, includes, 45.ft.  2_conductor cable, and _5 cable clamps. Contacts: SPD double make leaf contacts, SA O 480 VAC

The VS2 Series switches arc shock sensitive mechanisms for shutdown of engine or electric motor powered equipment. These switches use a magnetic latch to ensure reliable operation. Explosion proof "EX" models for hazardous locations are available.

Designed to Detect Shock/Vibration in 3 Planes of Motion

Fully Adjustable Includes Magnetic Latching Feature

Manual or Electric Reset

Basic Operation

 Pushing the reset button moves the tripping latch into a magnetically held position. A shock/vibration will move the magnet beyond this holding position, thus freeing the spring loaded tripping latch to transfer the contacts and shutdown the machinery (see dimensional diagrams in the following pages for visual representation of parts).

 Ideal for use on engines, pumps, compressors, heat exchangers and pumping units, the VS2 Series can be used anywhere shutdown protection from damaging shock/vibration is desired. Switches are field adjustable to sensitivity required in each application

Remote Reset Option (VS2EXR and VS2EXRB) The remote reset option includes a builtin electric solenoid which allows reset of tripped unit from a remote location. Available for 115 VAC or 24 VDC.

Model VS2EXR Shock and Vibration Switch

• For Group B Locations
• Snap-switch Contacts 9-1/8 in.
(232 mm)
• DPDT Feature Optional Mounting
• TATTLETALE© Reset Button
6 in.
Model VS2EXRB is constructed for use in Class I, Division 1,

  • Remote Reset Feature

  • NEMA 7 Specifications

  • Snap switch Contacts

  • TATTLETALE' Reset Button

Model VS2EXR features an electric remote reset feature in addition to the “TATTLETALE" reset button. The VS2EXR uses only one SPDT snap‑switch and is CSA and UL listed for Class I, Division I, Groups C & D hazardous locations. It is constructed to meet NEMA 7 specifications.

Contact Rating:
5 A CU? 125-480 VAC
1/2 A Cq? 125 VDC
1/4 A L 250 VDC
2 A Resistive 30 VDC
1 A Inductive 30 VDC

Remote Reset Rating:
115 VAC or 24 VDC (Specify)
350 mA AC/DC


Learn more: Murphy Shock/Vibration Control Switches - Installation Instructions

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